Gas-engine.



S. HAGERMAN GAS ENGINE.

APPucAnoN FILED JAN.1 6.1915.

Patented Oct. 30, 1917.

:Juventa/z,

SAMUEL BAGEBMAN, F GRYSTAL, IGHIGAN.

GAS-ENGINE.

. Speencation of Letters Patent. i Patented 0015.30, 1.91.7@

Applicaticn med January 16, 1915. Serial No. 2,612.

To all 'whom t may concern: Be it known that I, SAMUEL HAGERMAN,

a citizen of the United States, residing at 'Crystahin the county of Montcalm I'and State of Michigan, have invented certain new and useful Improvements in Gas-Engines, of which the following is a specification.

The invention purposes to enable the constructionof an internal combustion engine utilizing a cylinder and reciprocating iston in which a working impulse mav be lmparted on every inward movement of the piston, but which will retain the advantages of the scavenging action of the usual four- 15 cycle engine and of the suction stroke. A

further object is to enable the construction of such an engine in compact form and to provide a novel construction of operative parts of a desirable character. 2a Additional objects and advantages and features of invention will appear from the construction, combination and arrangement of parts hereinafter set forth, and shown in the drawings, 'in which,

Figure 1 isa vertical sectional view of an engine embodying the principles of my invention,

Fig. 2 is a similar view thereof at the end of the working stroke,

Fig. 3 is a fragmentary vertical section at ht angles to Fig. 1.

here is illustrated an engine including a crank case and crank shaft 11 mounted therein of any suitable construction, the 35 crank case having a cylinder 12 mounted thereon comprising a casting .closed at the outer end, suitably cored to form a water jacket 13, and finished on the interior to receive the piston 14, the latter also being of a 40 familiar type, and connected to the shaft by the usual connecting rod.

The cylinder is provided with an inlet port immediately adjacent its head 16 with which suitable inlet connections 17 may be made. An exhaust port 18 is formed adjacent the lower limit of movement 'of the piston 14, in the side of the cylinder, and a spark plug 20 mounted at a suitable point in the cylinder. A second piston 19 is mounted slidably in the cylinder outwardly of the piston 14, with which reciprocating connections are made, extending through a suitable packing boX 21 in the head 16, this connection comprising a stem 22, the outer end of which is connected to one end of an oscillating arm 2.3, pivoted upon a suitable lug 24 on the cylinder head, sliding connection being made with the arm. A suitable spring 25y is conned between the arm and the cylinder head to hold the arm yieldably at the outer limit of its movement, whereby the piston is raised against the cylinder head. Extending transversel over this arm there is a cam shaft 26 revolu 1y mounted in suitable brackets 27 and 28, and having a cam 29 thereon arranged to bear upon the arm 23. This shaft is extended outwardly from the cylinder over the port l5, and is provided with a sprocket 30, engaged with which there is a chain 31 driven from the Ashaft 11, as shown. The shaft 26 should ro- This crank is disposed on a radius of the shaft 26 opposite the side on which the maximum radius of the cam 29 occurs, so that the valve opens when the piston moves downwardly and closes on its return.

The port 15 is of such dimensions on its inner side that it communicates with the space above the piston as soon as the latter begins to move downwardly and extends below the piston when the latter is at the upper limit of its movement, the valve 34 being suitably recessed to provide a clearance between the piston and valve.

In operation, with the parts arranged as shown in Fig. 1, a charge having been admitted, ignition is caused by any suitable means, and the crank shaft having a slight momentum, the piston 14 will be caused to move downwardly. The cam 29 is so shaped that the piston 19 will remain stationary until the piston 14 has completed a large part of its movementJ when it will be rapidly moved downwardly, this movement being continued until the piston14 has begun its return movement, with a resultant scavenging action. The piston 19 sto s short of the piston 14 at the lower limit ci) its movement, although the extent of movement should be somewhat greater than illustrated in the drawings to attain the fullest efficiency. Upon outward movement of the piston 14 in the cylinder the piston 19 is returned to initial position with great raf pidity. During the downward movement etj the piston 19, the valve 34 bein e en, the charge will be drawn inte the cy in er over the piston, through the inlet port, and the valve closes in time to prevent escape of the charge through the inlet .port as the piston 19 rises. The recessed limer side of the valve 34 will allow passageyof the gases te the inner side of the piston 19 after it rises sufficiently. Y

What is claimed is:

in an en ine of the character described, a headed c inder having an inlet port adjacent the ead and a by-pass recess, in the inner face of the cylinder in communication with the port and extending to the head, a'

Leanne@ Pisten in the clinder constructed to lie within the iongltu inal limits of this by-pass recess at times, a Working piston in the cylinder, means to reciprocate the iirst named piston, a Valve for said port slidable in said recess and across said port having an inner face spaced from the projected arc of the cylinder inner face, and operative connections between the valve and the Working piston for the purposes described.

In testimony whereof have aixed my signature in presence of two witnesses.

' SAMUEL HAGERMAN. Witnesses R. B. SMITH, Hanna SHArrnn. 

